Cliff Cottage, near Bangor Pier. Looks late Georgian 1820s? (but not 'listed') It has been said Telford stayed here whilst the Menai Bridge was being built.
by Snapshooter46 Flickr (CC Lic)Greenough & Sons (Anglesey) website - "Cliff Cottage, Bangor - Re-roofing at historic property overlooking Menai Straits, using new Penrhyn slate"